Spring clamp for formwork – Chiroz

Spring clamp for formwork – "chiroz", "frog", "clip", rebar clamp or formwork lock, all these names refer to one excellent solution for tightening formwork shields. Let's look at all its qualities and advantages when using it.

For many years, specialists and craftsmen in monolithic construction have been using a proven method in the construction of formwork systems. To tighten the shields, clamping screws for formwork systems, clamping nuts, as well as a cone retainer and PVC tubes are used. It would seem to be a great combination that has been tested by time. But this method has one, but very significant drawback – when removing the formwork, holes remain in the concrete product, which negatively affect the strength of the structure. They require further processing and the use of additional solutions. So the use of chiros will help us solve this problem.

The method of tightening the formwork using spring clamps is extremely simple and practical. To do this, we take reinforcing rods with a thickness of 6 to 10 mm, fasten them to parallel formwork panels with each other. Then we insert our clamps onto the ends of the rebar. To fix the clamps, we use a special key for chiros. We put the key on the clamp, we fix our clamp with the upper lever, and we press it with the lower lever. That's the whole installation process. To remove such a lock, an accurate and gentle hammer blow on the tongue of the clamp is sufficient, the tension disappears after that and it is easily removed. The last step is to cut off the protruding parts of the reinforcing bar.


The use of chiros in the construction of the foundation formwork does not end. They are widely used in the construction of columns and monolithic walls, the laying of tunnel shafts, even in the construction of bridge supports.

Having considered the example of using spring clamps, we see the following advantages:

  • during installation, we will not need PVC pipes and cones, the savings are obvious
  • the cost of spring clamps is 2-3 times lower than sets of coupling screws and nuts
  • The installation/disassembly process is extremely simple and takes a minimum of time
  • the versatility of spring clamps allows them to be used in the most non-standard types of formwork

 

It is worth noting that there are clamps of different sizes and with different degrees of load. Reinforced spring clamps can withstand loads of up to 3 tons, also have an increased plate thickness and galvanized and hardened steel elements. The fastening mechanism itself is equipped with a heavy-duty tight spring. Such clamps are not subject to corrosion and external influences. As for the keys for chiros, there are also reinforced ones here, they are galvanized and made with special steel and with a reinforced mechanism. You can choose the appropriate materials in our product catalog.